Justin Bieber turns 20 after a year the pop brat will want to forget

From numerous drug busts to singing to his grandma naked, the Canadian artist has not been shy from media attention.

Since his 19th birthday, which he called his 'worst ever' after being rejected from a club, he seems to have spent more time causing trouble than actually producing music.

As he faces court next month for allegedly assaulting a limo driver - his year of mayhem seems to have ended for now.

The Beauty And The Geek singer began as a small nuisance but his bad behaviour has escalated quickly over the 12 months.

In March last year, he turned up two hours late to one of his gigs in London.

His regular horde of screaming girls were definitely not screaming for the right reasons.

And to make things worse, the following day he made his adoring fans wait for another three hours at a meet and greet.

Fans' parents labelled him an "arrogant git" complaining that he did not even talk to their children.

LOVE: Bieber sang naked to his grandma in a strange video [SPLASH]

“Hopefully she would have been a belieber.”

Justin Bieber talking about Anne Frank

Bieber posted a lengthy reaction to his media onslaught on Twitter later that month and was spotted wearing a gas mask to a top London restaurant.

But bad boy Bieber continued in his childish ways.

On a flight back from Germany in April, he caused outrage when he reportedly left his pet monkey Mally with customs.

Later that month in Sweden, police said they found narcotics on his tour bus saying there was a "strong smell of marijuana".

And then in Amsterdam signed the guestbook at the Anne Frank museum according to workers, saying: "Truly inspiring to be able to come here. Anne was a great girl. Hopefully she would have been a belieber."

After a two-month break from the big headlines, he was back.

He allegedly spat at a DJ in a nightclub because he was taking too many photos.

The DJ said he knew nothing about taking photos but said brat Bieber used 'foul language' towards him.